The effect of nano silica on short term drying shrinkage of POFA cement mortars

Farzadnia, Nima; Noorvand, Hossein; Yasin, Abdirahman Mohamed; Aziz, Farah Nora Aznieta Abdul

doi:10.1016/j.conbuildmat.2015.07.132

Cited by 80 publications

(32 citation statements)

References 44 publications

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“…They ranged from 11 to 20% in the nano-VS5-based concretes prepared at w/b ratios of 0.7 and 0.5, respectively. These results are in well agreement with that reported in literature [24,36,37]. The lower workability obtained when using nano-VS, particularly at high replacement level, i.e.…”

Section: Methodssupporting

confidence: 93%

Efficiency of nano-volcanic scoria in the concrete binder

al-Swaidani

2019

SN Appl. Sci.

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The objective of this study is to investigate the efficiency of volcanic scoria when added to the concrete binder at a nano-scale. Nano volcanic scoria (nano-VS) was obtained by grinding a local volcanic scoria for 6 h. Twenty-four concrete mixes with four w/b ratios (0.4, 0.5, 0.6 and 0.7) and six-replacement levels of nano-VS (0%, 1%, 2%, 3%, 4%, and 5%) have been produced. The investigated concrete properties were the compressive strength, the water penetration depth, the concrete porosity and the chloride ion permeability. Workability of fresh concrete mixes has been also determined. The efficiency factor (k) of nano-VS in terms of compressive strength was calculated using the Bolomey equation. Durability indicators have been used to globally evaluate the behavior of nano-VS-based binder concrete versus control concrete. The results revealed that the efficiency factor (k) decreased to some extent when the nano-VS content was bigger than 4%. The calculated durability indicators showed that the nano-VS contents of 3% and 4% had approximately the highest indicators values. These indicators would be helpful for concrete mix designers. Some correlations between the investigated properties were derived from the analyzed data. The modification of the microstructure of nano-VS-based cement paste has been observed, as well.

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Section: Methodssupporting

confidence: 93%

Efficiency of nano-volcanic scoria in the concrete binder

al-Swaidani

2019

SN Appl. Sci.

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“…The significantly higher drying shrinkage of fly ash mortars containing NS can be attributed to the formation of significantly higher CSH gels due to pozzolanic reaction of SiO 2 with CH in the matrix, which holds higher amount of gel water and releases during drying . The removal of interlayer water film from the CSH gel structure and the tortuosity of the transport passage through the capillary network cause a strong driving force which tends to induce contraction of the matrix . It can also be seen that both fly ash mortars containing 60% fly ash exhibited significantly higher drying shrinkage than other low fly ash contents, and a similar result is also reported by Huang et al…”

Section: Resultsmentioning

confidence: 92%

Effects of fly ash fineness, nano silica, and curing types on mechanical and durability properties of fly ash mortars

Arel

Shaikh

2017

Structural Concrete

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The effects of nano silica (NS), three different fly ash contents, two curing types and exposure to sulfate solution on mechanical and durability properties of two types of fly ash mortars are evaluated in this study. Results show that the wet-cured mortars containing finer fly ash exhibited higher compressive strength at all ages than that containing coarser fly ash. The addition of colloidal NS improved the compressive strength of both types of fly ash mortars at all ages with significant improvement at early ages. The effect of steam curing slightly improved the 3-day compressive strength of control cement mortar and both fly ash mortars with reduction starts from 7 days onwards. However, the addition of NS improved the compressive strengths at all ages of all fly ash concretes subjected to steam curing. The exposure to sulfate solution adversely affected the compressive strength at all ages of all fly ash concretes irrespective of fly ash contents, fineness types, and NS addition. Fly ash mortars containing finer fly ash exhibited slightly higher drying shrinkages but lower rate of water sorption than the mortars containing coarser fly ash. The addition of NS significantly increased the drying shrinkage and decreased the rate of water sorption of both types of fly ash mortars containing all fly ash contents. K E Y W O R D Scompressive strength, finer fly ash, nano silica, sorptivity, steam curing, sulfate attack

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“…The nanometric photocatalyst probably influences the microstructure of plasters, which affects the course of shrinkage changes. Farzdania et al [33] registered that the inclusion of nanosilica into cement mortars limited the drying shrinkage rate. They connected the results with the reduction of total porosity and the filling effect by nanoparticles in building matrix.…”

Section: Shrinkagementioning

confidence: 99%

Combined Effect of Photocatalyst, Superplasticizer, and Glass Fiber on the Photocatalytic Activity and Technical Parameters of Gypsum

et al. 2020

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In this study, gypsum plasters enriched with the modified photocatalyst TiO2/N and additive components were prepared and analyzed in detail. The aim of this work was to recognize the combined impact of a photocatalyst, polycarboxylic superplasticizer (SP), and glass fiber (F) on the properties of the composed building materials. The mutual compatibility was verified in relation to self-cleaning and air-purifying activity as well as to the technical parameters defined in standards for gypsum materials. The measurements revealed that photocatalytic gypsum material can have high mechanical strength and limited shrinkage as a result of superplasticizer contribution in form of a water-reducing and well-dispersive agent. Normal consistency was achieved by the addition of 0.01 wt % of SP to photocatalytic gypsum mortar or by the addition of 0.2 wt % of SP with a 12% reduction of water. This study also explains why glass fiber fulfills the role of inner reinforcement only if a superplasticizer is simultaneously added to the gypsum matrix. It is possible, by the combined effect of TiO2/N, a polycarboxylic superplasticizer, and glass fiber, to achieve NOx degradation at a high level. Moreover, the significantly improved self-cleaning properties of the complex gypsum plasters surfaces from dye pollutants in comparison to a gypsum plaster with solely a TiO2/N photocatalyst indicate the synergistic effect of the three considered additives.

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The effect of nano silica on short term drying shrinkage of POFA cement mortars

Cited by 80 publications

References 44 publications

Efficiency of nano-volcanic scoria in the concrete binder

Efficiency of nano-volcanic scoria in the concrete binder

Effects of fly ash fineness, nano silica, and curing types on mechanical and durability properties of fly ash mortars

Combined Effect of Photocatalyst, Superplasticizer, and Glass Fiber on the Photocatalytic Activity and Technical Parameters of Gypsum

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